<template> 
  <el-container class="home-container">
      <!-- 头部 -->
    <el-header>
        <div>
            <div class="logo"></div>
            <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout()">退出</el-button>
    </el-header>
    <!-- 主体 -->
    <el-container>
        <!-- 左侧 -->
        <el-aside :width="isCollapse?'64px':'200px'">
            <div class="toggle-button" @click="toggleCollapse()">|||</div>
            <!-- unique-opened	是否只保持一个子菜单的展开 (布尔值) -->
            <!-- collapse-transition	是否开启折叠动画 -->
            <!-- router	使用 vue-router 模式,激活导航时以 index 作为 path 进行路由跳转 -->
            <!-- default-active	当前激活菜单的 index -->
            <el-menu
            :unique-opened="true"
            :collapse="isCollapse"
            :collapse-transition="false"
            router
            :default-active="activePath"
            class="el-menu-vertical-demo"
            background-color="#333744"
            text-color="#fff"
            active-text-color="#409EFF">
            <!-- 一级菜单 -->
                <el-submenu :index="(item.id).toString()" v-for="item in menuList" :key="item.id">
                    <!-- 一级菜单的模板区 -->
                    <template slot="title">
                        <!-- 图标 -->
                        <i :class="iconsObj[item.id]"></i>
                        <!-- 文本 -->
                        <span>{{item.authName}}</span>
                    </template>
                    <!-- 二级菜单 -->
                    <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id"
                    @click="saveNavState('/'+subItem.path)">
                         <template slot="title">
                            <i class="el-icon-menu"></i>
                            <span>{{subItem.authName}}</span>
                        </template>
                    </el-menu-item>
                </el-submenu>
            </el-menu>
        </el-aside>
        <!-- 右侧 -->
        <el-main>
            <router-view></router-view>
        </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
    name: 'HomePage',
    data() {
        return {
            // 左侧菜单数据
            menuList: [],
            iconsObj: {
                '125': 'iconfont icon-users',
                '103': 'iconfont icon-tijikongjian',
                '101': 'iconfont icon-shangpin',
                '102': 'iconfont icon-danju',
                '145': 'iconfont icon-baobiao'
            },
            isCollapse: false,
            // 被激活的地址
            activePath: ''
        }
    },
    methods: {
        logout(){
            // 清空token
            window.sessionStorage.clear()
            // 跳回登录页
            this.$router.push('/login')
        },
        async getMenuList(){
            const { data:res } = await this.$http.get('menus')
            if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
            this.menuList = res.data
            console.log(res)
        },
        // 折叠展开侧边栏
        toggleCollapse(){
            // collapse	是否水平折叠收起菜单（仅在 mode 为 vertical 时可用）
            this.isCollapse = !this.isCollapse
        },
        // 保存连接激活状态
        saveNavState(activePath){
            window.sessionStorage.setItem('activePath',activePath)
            this.activePath = activePath
        }
    },
    created(){
        this.getMenuList()
        this.activePath = window.sessionStorage.getItem('activePath')
        // console.log(this.activePath)
    }
}
</script>

<style lang="less" scoped>
.home-container{
    height: 100%;
}
.el-header{
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    div{
        display: flex;
        align-items: center;
        span{
            margin-left: 15px;
        }
    }
}
.el-aside{
    background-color: #333744;
    .el-menu{
        border-right: none;
    }
}
.el-main{
    background-color: #eaedf1;
}
.iconfont{
    margin-right: 10px;
}
.toggle-button{
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
.logo{
    margin-left: 10px;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: linear-gradient(to right bottom,red,white);
}
</style>